Definition of menilite in English:

menilite

noun

Mineralogy
  • An impure variety of opal of a dull greyish or brownish colour, occurring as round or flattened concretions; a nodule of this material.

Origin

Early 19th century. From French ménilite (H. B. de Saussure in J. C. de la Métherie Théorie de la Terre III. 461) from ménil- (in Ménilmontant (given by de Saussure as Mesnil-Montant), the name of a district of Paris where the stone is found) + -ite.

Pronunciation

menilite

/ˈmɛnɪlʌɪt/